The subverted Special-K lady ad was featured in a Sociological Images post: Resistance to Objectifying Advertising! This post features a few other nice examples of feminist graffiti we hadn’t seen before.
This one is especially cool, apparently it was done by an unknown subvertiser in the 70’s:
Image description: black and white photo of a billboard ad with a photo of a car, a “Fiat” logo and the text: “If it were a lady it would get its bottom pinched.” Someone has spraypainted on: “If this lady was a car she’d run you down.” This photo originates from a Flickr page here.